C#网络编程简单实现通信小例子
1、主界面
2、源代码
Client
public partial class FormClient : Form { //声明一个Socket public Socket newClient; //判断是否连接成功 public bool isConnected; //定义一个线程 public Thread myThread; //定义一个委托 public delegate void MyInvoke(string str); public FormClient() { InitializeComponent(); } private void Connection() { //IPAddress ip=null; //int port=888; byte[]data=new byte[1024]; //创建一个新的Socket newClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //获取IP地址 #region GetIP //if (txtIP.Text == string.Empty) //{ // MessageBox.Show("远程IP不能为空"); //} //else //{ // string pattrn = @"((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))"; // if (System.Text.RegularExpressions.Regex.IsMatch(txtIP.Text.Trim(), pattrn)) // { // ip = IPAddress.Parse(txtIP.Text.Trim()); // } // else // { // MessageBox.Show("IP地址格式不正确！"); // } //} #endregion //获取端口号 #region GetPort //if (System.Text.RegularExpressions.Regex.IsMatch(@"^[-]?\d+[.]?\d*$", txtPort.Text.Trim())) //{ // port = Convert.ToInt32(txtPort.Text.Trim()); //} //else //{ // MessageBox.Show("端口号格式不正确"); //} #endregion //封装网络端点 IPEndPoint ie = new IPEndPoint(IPAddress.Parse(txtIP.Text.Trim()),Convert.ToInt32(txtPort.Text.Trim())); #region Connection try { //建立与远程主机之间的连接 newClient.Connect(ie); //设置连接服务器控件的属性 // btnConnection.Enabled = false; //设置连接状况 btnConnection.Text = "停止连接"; //isConnected = true; } catch (SocketException ex) { MessageBox.Show("连接服务器失败" + ex.Message); return; } #endregion //启动当前线程用于接收消息 ThreadStart myThreadDelegate = new ThreadStart(ReceiveMessage); myThread = new Thread(myThreadDelegate); myThread.Start(); } /// <summary> /// 接收消息 /// </summary> public void ReceiveMessage() { while (true) { //定义字节数组大小 byte[]data=new byte[1024]; //获取数组长度 int recv = newClient.Receive(data); //接收数据 string strData = Encoding.UTF8.GetString(data, 0, recv); //显示信息 ShowMessage(newClient.RemoteEndPoint.ToString()+":"+strData+"\r\n"); } } /// <summary> /// 显示消息 /// </summary> /// <param name="msg">接收的消息，可能来自Client/也可能来自Server</param> public void ShowMessage(string msg) { //如果是在创建该控件以外的线程调用该控件 if (lbMessage.InvokeRequired) { MyInvoke myInvoke = new MyInvoke(ShowMessage); //lbMessage.Invoke(myInvoke, new object[] { msg }); lbMessage.Invoke(myInvoke,new object[]{"远程主机:"+msg}); } else { lbMessage.Items.Add(msg); } } private void btnSend_Click(object sender, EventArgs e) { if (txtSendMessage.Text == null) { txtSendMessage.Text = "发送消息不能为空"; //停留1秒消失 } else { //获取发送数据长度 int myMessLength = txtSendMessage.Text.Length; //将数据转换为字节数组 byte[] data = new byte[myMessLength]; data = Encoding.UTF8.GetBytes(txtSendMessage.Text); //发送数据 int i = newClient.Send(data); //将数据显示在Client ShowMessage("我说：" + txtSendMessage.Text + "\r\n"); } } private void btnConnection_Click(object sender, EventArgs e) { if (btnConnection.Text == "连接服务") { Connection(); } else { newClient.Close(); } } private void FormClient_Load( object sender, EventArgs e ) { } }
Server
public partial class Form1 : Form { public Form1() { InitializeComponent(); } public Thread myThread;//声明一个线程实例 public Socket newSocket;//声明一个Socket实例 public Socket serverSocket;//声明服务端Socket实例 public Socket clientSocket;//声明客户端Socket public delegate void MyInvoke(string str);//声明一个委托 public IPEndPoint localEP;//声明本地网络端点 public EndPoint remote;//声明网络地址 public int localPort;//声明本地端口号 public Boolean isListening;//声明服务端是否监听 public Hashtable _sessionTable;//用于记录用户信息 public bool btnState=true; //设置服务端监听的端口号属性 public int SetPort { get { return localPort; } set { localPort = value; } } //设置监听 public void Listening() { SetPort = int.Parse(txtPort.Text.Trim());//设置端口号 newSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//初始化Socket实例 newSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);//允许Socket被绑定在已使用的地址上 localEP = new IPEndPoint(IPAddress.Any, SetPort);//初始化网络端点信息 try { _sessionTable = new Hashtable( 50 ); newSocket.Bind(localEP);//绑定端口 newSocket.Listen(10);//开始监听 newSocket.BeginAccept(new AsyncCallback(OnConnectRequest),newSocket);//开始异步接受连接 } catch(Exception ex) { ShowMessage(ex.ToString()); } } private void btnStartServer_Click(object sender, EventArgs e) { ThreadStart myThreadDelegate = new ThreadStart(Listening);//新建一个线程用于委托 myThread = new Thread(myThreadDelegate); if (btnState) { myThread.Start(); stateBar.Text = "服务已经启动，等待客户端连接"; btnState = false; btnStartServer.Text = "停止服务"; } else { myThread.Interrupt(); myThread.Abort(); btnState = true; btnStartServer.Text = "开始服务"; stateBar.Text = "服务已停止"; } } //显示信息 public void ShowMessage(string msg) { if (rtbMessage.InvokeRequired) { MyInvoke myInvoke = new MyInvoke(ShowMessage); rtbMessage.Invoke(myInvoke, new object[] { msg }); } else { rtbMessage.AppendText(msg); } } public void OnConnectRequest(IAsyncResult ar) { serverSocket = (Socket)ar.AsyncState; clientSocket = serverSocket.EndAccept(ar);//异步接收连接 string welcomeStr = "欢迎登陆到服务器"; byte[] data = System.Text.Encoding.UTF8.GetBytes(welcomeStr); remote = clientSocket.RemoteEndPoint;//获取远程终点信息 ShowMessage(remote.ToString()+" 连接成功 "+DateTime.Now.ToString()+"\r\n"); clientSocket.Send(data,data.Length,0); UserListOperate(clientSocket.RemoteEndPoint.ToString()); _sessionTable.Add(clientSocket.RemoteEndPoint,null);//将连接成功的客户端实例添加到哈希表中 serverSocket.BeginAccept(new AsyncCallback(OnConnectRequest), serverSocket);//等待新的客户端连接 //接收数据 ReceiveMessage(); } //接收数据 public void ReceiveMessage () { while (true) { byte[]data=new byte[1024]; int recv = clientSocket.Receive( data ); string message = Encoding.UTF8.GetString(data,0,recv); ShowMessage(clientSocket.RemoteEndPoint.ToString()+":"+message+"\r\n"); } } //添加用户列表 public void UserListOperate(string msg) { //在线程里以安全的方式调用控件 if (lbUserList.InvokeRequired) { MyInvoke myInvoke = new MyInvoke(UserListOperate); lblUserList.Invoke(myInvoke, new object[] { msg }); } else { lbUserList.Items.Add(msg); } } //删除用户列表 public void UserListOperateRemove(string msg) { if (lbUserList.InvokeRequired) { MyInvoke myInvoke = new MyInvoke(UserListOperateRemove); lbUserList.Invoke(myInvoke, new object[] { msg }); } else { lbUserList.Items.Remove(msg); } } //发送广播 public void BroadCast() { string strMessage = txtMessage.Text; Byte[] data = Encoding.UTF8.GetBytes(strMessage); foreach (DictionaryEntry item in _sessionTable) { EndPoint temp = (EndPoint)item.Key; clientSocket.SendTo(data, temp); ShowMessage("我："+strMessage+"\r\n"); } txtMessage.Text = ""; } private void Form1_Load(object sender, EventArgs e) { //获取本机IP IPAddress[] ip = Dns.GetHostByName( Dns.GetHostName() ).AddressList; lblIP.Text+=ip[0].ToString(); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { //窗体关闭时判断线程是否为空 if (myThread != null) { myThread.Abort(); } throw new Exception(); } private void btnSend_Click(object sender, EventArgs e) { BroadCast(); } }
如有不当之处，烦请指教。
分类: C#网络编程
